curl --request POST \
  --url https://api.example.com/auth/signin \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "jsmith@example.com",
  "password": "<string>"
}
'

{
  "message": "<string>",
  "user": {},
  "accessToken": "<string>",
  "idToken": "<string>",
  "refreshToken": "<string>",
  "expiresIn": 123,
  "tokens": {
    "accessToken": "<string>",
    "idToken": "<string>",
    "refreshToken": "<string>",
    "expiresIn": 123,
    "tokenType": "Bearer"
  },
  "tokenType": "Bearer"
}